<template>
    <div>
      <!--面包屑导航各区域-->
      <el-breadcrumb separator="/">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item :to="{ path: '/goods' }">添加列表</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图-->
      <el-card>
        <!--提示区域-->
        <el-alert show-icon title="添加商品信息" type="info" :closable="false" center></el-alert>
        <!--步骤条-->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!--tabs栏区域-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px"
           label-position="top">
          <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave"
               @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps"
                  @change="handleChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!--渲染表单的Item-->
              <el-form-item :label="item.attr_name" v-for="item in manyTableDate" :key="item.attr_id">
                <!--复选框-->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="checkbox" v-for="(checkbox, index) in item.attr_vals" :key="index" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!--action : 表示图片要上传到的后台请求API地址-->
              <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove"
                list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!--富文本编辑器组件-->
              <quill-editor v-model="addForm.goods_introduce"/>
              <!--添加商品的按钮-->
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
      </el-card>

      <!--图片预览-->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" width="100%">
      </el-dialog>
    </div>

</template>

<script>
import _ from 'lodash'
export default {
  name: 'add',
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: '',
        goods_weight: '',
        goods_number: '',
        // 商品所属的分类数据
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 表单的验证规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品', trigger: 'blur' }
        ]
      },
      // 获取级联选择器的数据
      catelist: [],
      // 级联选择器读取属性
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表
      manyTableDate: [],
      // 静态属性列表
      onlyTableDate: [],
      // 上传的图片url
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传的headers
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      // 图片对话框显示隐藏
      previewVisible: false,
      attrs: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类的数据
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取列表失败！')
      this.catelist = res.data
    },
    // 级联选择器的cheange事件
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // Tabs标签页切换钩子函数
    beforeTabLeave(Active, oldActive) {
      // Active 表示需要进入的某个标签页
      // oldActive 表示从某个页离开的标签页
      if (oldActive === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        // console.log(this.addForm.goods_cat)
        // console.log(oldActive)
        // this.beforeTabLeave()
        return false
      }
    },
    async tabClicked() {
      if (this.activeIndex === '1') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableDate = res.data
      } else if (this.activeIndex === '2') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败！')
        this.onlyTableDate = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移出图片的操作
    handleRemove(file) {
      console.log(file)
      // 1.获取将要删除的图片临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics 数组中找到这个对应的索引值
      const fileId = this.addForm.pics.findIndex(item => item.pic === filePath)
      // 3.调用数组的splice方法 把图片信息对象，从pics数组中移出
      this.addForm.pics.splice(fileId, 1)
      console.log(this.addForm.pics)
    },
  //  监听图片上传成功的事件
    handleSuccess(response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = {pic: response.data.tmp_path}
      // 2.将图片信息对象。push 到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 点击添加商品按钮
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单')
        }
        // 深拷贝一份addForm 到form
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableDate.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableDate.forEach(item => {
          const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // 发送请求添加商品
        // 商品的名称，必须是唯一的
        // console.log(form)
        const {data: res} = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败！')
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    // 过滤三级列表的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.btnAdd{
  margin-top: 15px;
}
</style>
